EP0044137B1 - Track link for a tracked vehicle - Google Patents
Track link for a tracked vehicle Download PDFInfo
- Publication number
- EP0044137B1 EP0044137B1 EP81302624A EP81302624A EP0044137B1 EP 0044137 B1 EP0044137 B1 EP 0044137B1 EP 81302624 A EP81302624 A EP 81302624A EP 81302624 A EP81302624 A EP 81302624A EP 0044137 B1 EP0044137 B1 EP 0044137B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slideway
- shell
- track link
- load bearing
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/26—Ground engaging parts or elements
- B62D55/28—Ground engaging parts or elements detachable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/20—Tracks of articulated type, e.g. chains
- B62D55/205—Connections between track links
- B62D55/21—Links connected by transverse pivot pins
- B62D55/211—Bitubular chain links assembled by pins and double connectors
Definitions
- This invention relates to a track link for a tracked vehicle, the link being of the type having a detachable ground engagement pad according to the preamble of claim 1.
- a track link is described in US-A-3266853 for example.
- ground engagement pads are known, most of which comprise a resilient pad bonded to a metal bearer plate.
- the bearer plate may be directly bolted to the track link or, where speedy replacement is required, the plate may be shaped so as to slide into a channel having two opposing grooves, herein referred to as a slideway, in the track link where it may be secured against an end stop either by screw fixing means or by a resilient look, as described in GB-A-1 405 742 for example.
- a resilient pad 100 is attached to a bearer plate 101 .of bowed cross-sectional configuration extending into two lateral engagement flanges 102 and 103 which engage with the two opposed grooves 104 and 105 of a track link 106.
- a load L supported by the pad 106 in engagement with the ground 107 acts to extend the pad and plate laterally to engage the flanges more fully with the grooves.
- the centrifugal force generated at that moment can be of the order of 150 g for a vehicle travelling at 35 to 40 miles per hour (appr.
- the distortion is incremental for each application of centrifugal force F, i.e., every time the track link reverses direction at the upper leading edge of the track.
- the flanges can suffer sufficient inward deflection to become disengaged from the grooves, and the whole plate, together with its resilient pad, is flung out.
- the present invention seeks to provide a track link having a slidable ground engagement pad which will not readily disengage from the link under the action of centrifugal forces.
- the solution of the problem is effected by the features according to the characterising portion of claim 1.
- the present invention comprises a track link for a tracked vehicle, having a ground opposable face containing at least one slideway and including a load bearing shell of bowed cross sectional configuration longitudinally insertable into the slideway and supporting a resilient ground engagement pad disposed so as to protrude outwardly from the ground opposable face when the shell is located in the slideway; characterised in that the shell has in-turned longitudinal edges defining a partially enclosed interior surface and a reflex exterior surface, which exterior surface is engagable with the slideway at an inner bearing interface substantially parallel with the ground opposable face and at each of a co-planar pair of outer bearing interfaces parallel with and opposed to the inner bearing interface, the resilient ground engagement pad being secured to the partially enclosed interior surface of the shell.
- the slideway is preferably disposed transversely to the direction of motion of the track link.
- Both the slideway and the load bearing shell may be parallel sided and provided with co-operative stops which abut when the shell is fully inserted in the slideway.
- both may be slightly tapered so as to interlock only when the shell is fully inserted in the slideway, with the advantage of greater ease of insertion and withdrawal.
- fastening means are also provided to retain the shell in the fully inserted position, which means may comprise a screw fastener or a snap lock.
- the in-turned longitudinal edges of the shell are C-form to provide the necessary bearing surfaces at both inner and outer interfaces with the slideway, and the shell may conveniently comprise a longitudinal part-cylinder or part-cone of flattened, basically elliptical cross- section, locatable in the slideway with its major axial plane disposed parallel with the ground opposable face.
- the load bearing shell may be a metal such as steel or plastics material such as nylon, either of which may be bonded directly to a rubber or elastomeric ground engagement pad.
- the shell may itself be of hard rubber or elastomer, moulded integrally with a pad of similar but softer material.
- the track link 1 illustrated in Figure 1 has a central horn 2, wheel paths 3, rubber bushed pins 4, end and centre connectors 5 and 6 for coupling to a further pin 4 of an adjoining similar link (not shown), opposing end faces 7, and a ground opposable face 8.
- the face 8 is provided with two identical parallel-sided slideways 13, axially aligned and accessible one from each end face 7, each having opposed retaining grooves 14, an inner bearing surface 15 and outer bearing surfaces 16.
- Located in each slideway 13 is a rubber ground engagement pad 17 encased at its slideway-adjacent surfaces in a steel, load bearing shell 18.
- the load bearing shell 18, which is illustrated in detail in Figures 2, 3 and 4, is a flattened, longitudinal part-cylinder having an inner bearing surface 19 adjacent the inner bearing surface 15 and outer bearing surfaces 20 adjacent the outer bearing surfaces 16. Gaps 21 provided in the bearing surfaces 20 enable the weight of the shell to be reduced without serious impairment of its function.
- An axial stub screw 22 is attached to the leading end 23 of the shell 18, and the pad 17 ( Figure 1) is bonded to the internal surface 24 of the shell. The complete assembly is inserted, end 23 first, into the slideway 13 until the screw 22 locates in a clearance hole (not shown) at the far end of the slideway where it can be secured with nuts (not shown).
- This compression of the shell additionally enhances the grip of the in-turned lateral edges upon the contained portion of the resilient pad.
- this shell unlike the prior art bearer plate previously discussed with respect to Figures 12 and 13, is restored to its original shape by the spring action of the reflex bowed configuration with the result that there is no incremental distortion at each application of centrifugal force.
- the inwardly acting reactive force R which acts disadvantageously upon the flanged bearer plate of the prior art to disengage it from the slideway, has been turned to advantage in the present invention by reflexing the edges of the bowed shell back through 180°, thereby causing the reactive force R to increase engagement with the slideway.
- FIG. 5 to 9 An alternative load bearing shell 30 in accordance with the present invention, having tapered edges 31 for insertion in a correspondingly tapered slideway (not shown), is illustrated in Figures 5 to 9.
- This load bearing shell is integrally moulded in nylon and reacts in operation with its slideway in exactly the same manner as that described for the preceding embodiment.
- the shell 30 is provided with a locking tongue 32 centred at the apex of the bowed configuration, which causes the shell to compress inwardly whilst being pushed along the slideway until the shell and slideway tapers are fully engaged, whereupon the tongue snaps outwardly into engagement with a corresponding aperture (not shown) in the slideway.
- Axial ribs 33 provide reinforcement of the tongue 32 in its condition of engagement with the slideway.
- An additional advantage of the bowed configuration of the load bearing shell of this invention is that its inherent flexibility permits its insertion into a cast slideway requiring no expensive machining.
- the invention further provides an appreciable saving in weight over conventional bolt-on-bearer plates and, in the case of the nylon shell, a considerable cost saving.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Navigation (AREA)
- Vehicle Body Suspensions (AREA)
- Tires In General (AREA)
Description
- This invention relates to a track link for a tracked vehicle, the link being of the type having a detachable ground engagement pad according to the preamble of claim 1. Such a track link is described in US-A-3266853 for example.
- Various types of ground engagement pads are known, most of which comprise a resilient pad bonded to a metal bearer plate. The bearer plate may be directly bolted to the track link or, where speedy replacement is required, the plate may be shaped so as to slide into a channel having two opposing grooves, herein referred to as a slideway, in the track link where it may be secured against an end stop either by screw fixing means or by a resilient look, as described in GB-A-1 405 742 for example.
- When driven over uneven ground, track links are subjected to considerable stresses and dimensional variations which can be sufficient to dislodge a slidable bearer plate from its slideway. A known solution to this problem is to provide the bearer plate with sufficient lateral elasticity to accommodate fluctuations in the separation of the two opposed grooves.
- One example of this solution, is disclosed in US-A-3266853, and will be described here with reference to Figure 12 of the drawings accompanying the present specification. In this solution a
resilient pad 100 is attached to abearer plate 101 .of bowed cross-sectional configuration extending into twolateral engagement flanges opposed grooves track link 106. A load L supported by thepad 106 in engagement with theground 107 acts to extend the pad and plate laterally to engage the flanges more fully with the grooves. - A further problem arises in use with high speed tracked vehicles however, as a result of the extreme centrifugal forces to which a track link can be subjected when it changes direction of travel at the upper leading end of the track, its forward velocity then being abruptly reduced from twice the speed at which the vehicle is travelling, to zero. The centrifugal force generated at that moment can be of the order of 150 g for a vehicle travelling at 35 to 40 miles per hour (appr. 50 to 65 km per hour) and when a flanged bearer plate of the aforementioned type is subjected to such an outwardly acting centrifugal force F (see Figure 13 of the accompanying drawings), the whole bearer plate is forced outwards, pressing the
engagement flanges grooves - The present invention seeks to provide a track link having a slidable ground engagement pad which will not readily disengage from the link under the action of centrifugal forces. The solution of the problem is effected by the features according to the characterising portion of claim 1.
- Accordingly the present invention comprises a track link for a tracked vehicle, having a ground opposable face containing at least one slideway and including a load bearing shell of bowed cross sectional configuration longitudinally insertable into the slideway and supporting a resilient ground engagement pad disposed so as to protrude outwardly from the ground opposable face when the shell is located in the slideway; characterised in that the shell has in-turned longitudinal edges defining a partially enclosed interior surface and a reflex exterior surface, which exterior surface is engagable with the slideway at an inner bearing interface substantially parallel with the ground opposable face and at each of a co-planar pair of outer bearing interfaces parallel with and opposed to the inner bearing interface, the resilient ground engagement pad being secured to the partially enclosed interior surface of the shell.
- For maximum resistance of the pad to shear encountered in use, the slideway is preferably disposed transversely to the direction of motion of the track link.
- Both the slideway and the load bearing shell may be parallel sided and provided with co-operative stops which abut when the shell is fully inserted in the slideway. Alternatively both may be slightly tapered so as to interlock only when the shell is fully inserted in the slideway, with the advantage of greater ease of insertion and withdrawal. Preferably, fastening means are also provided to retain the shell in the fully inserted position, which means may comprise a screw fastener or a snap lock.
- Preferably the in-turned longitudinal edges of the shell are C-form to provide the necessary bearing surfaces at both inner and outer interfaces with the slideway, and the shell may conveniently comprise a longitudinal part-cylinder or part-cone of flattened, basically elliptical cross- section, locatable in the slideway with its major axial plane disposed parallel with the ground opposable face.
- The load bearing shell may be a metal such as steel or plastics material such as nylon, either of which may be bonded directly to a rubber or elastomeric ground engagement pad. Alternatively the shell may itself be of hard rubber or elastomer, moulded integrally with a pad of similar but softer material.
- Embodiments of the invention will now be described by way of example only with reference to the following drawings of which
- Figure 1 is a perspective view of a track link having twin parallel-sided slideways, each fitted with a load bearing shell and a ground engagement pad,
- Figures 2, 3 and 4 are end, underside and side views respectively of the load bearing shell illustrated in Figure 1.
- Figures 5 to 8 are underside, top and both end views respectfully of an alternative, tapered load bearing shell suitable for use in a correspondingly tapered slideway,
- Figure 9 is a section on line IX-IX of Figure 5,
- Figures 10 and 11 are cross-sectional representations of the load bearing shell of Figure 1 drawn in load-bearing and centrifugally stressed condition respectively, and
- Figures 12 and 13 are cross-sectional representations of a prior-art bearer plate drawn in load-bearing and centrifugally stressed condition respectively.
- The track link 1 illustrated in Figure 1 has a
central horn 2,wheel paths 3, rubber bushedpins 4, end and centre connectors 5 and 6 for coupling to afurther pin 4 of an adjoining similar link (not shown),opposing end faces 7, and a ground opposable face 8. - The face 8 is provided with two identical parallel-
sided slideways 13, axially aligned and accessible one from eachend face 7, each having opposedretaining grooves 14, an inner bearingsurface 15 andouter bearing surfaces 16. Located in eachslideway 13 is a rubberground engagement pad 17 encased at its slideway-adjacent surfaces in a steel,load bearing shell 18. - The
load bearing shell 18, which is illustrated in detail in Figures 2, 3 and 4, is a flattened, longitudinal part-cylinder having aninner bearing surface 19 adjacent theinner bearing surface 15 andouter bearing surfaces 20 adjacent theouter bearing surfaces 16.Gaps 21 provided in thebearing surfaces 20 enable the weight of the shell to be reduced without serious impairment of its function. Anaxial stub screw 22 is attached to the leadingend 23 of theshell 18, and the pad 17 (Figure 1) is bonded to theinternal surface 24 of the shell. The complete assembly is inserted,end 23 first, into theslideway 13 until thescrew 22 locates in a clearance hole (not shown) at the far end of the slideway where it can be secured with nuts (not shown). - In operation, when the
pads 17 are in engagement with the ground and the track link 1 is bearing the weight of a supported vehicle as illustrated in Figure 10, the load L of the vehicle is transmitted to the ground via the interface ofinner bearing surfaces slideway 13 andshell 18 respectively. When the link is no longer bearing the weight of the vehicle and is being subjected to a centrifugal force F acting outwardly from the link 1 through thepad 17 as shown in Figure 11, theouter bearing surfaces 20 of theshell 18 are forced against theouter bearing surfaces 16 of theslideway 13 thereby generating a reactive force R which co-acts with opposing force F to compress the reflex bowed configuration of the shell, thus causing the inner bearingsurfaces retaining grooves 14. This compression of the shell additionally enhances the grip of the in-turned lateral edges upon the contained portion of the resilient pad. When the force F is removed, this shell, unlike the prior art bearer plate previously discussed with respect to Figures 12 and 13, is restored to its original shape by the spring action of the reflex bowed configuration with the result that there is no incremental distortion at each application of centrifugal force. - In essence, the inwardly acting reactive force R which acts disadvantageously upon the flanged bearer plate of the prior art to disengage it from the slideway, has been turned to advantage in the present invention by reflexing the edges of the bowed shell back through 180°, thereby causing the reactive force R to increase engagement with the slideway.
- An alternative
load bearing shell 30 in accordance with the present invention, havingtapered edges 31 for insertion in a correspondingly tapered slideway (not shown), is illustrated in Figures 5 to 9. This load bearing shell is integrally moulded in nylon and reacts in operation with its slideway in exactly the same manner as that described for the preceding embodiment. - The
shell 30 is provided with alocking tongue 32 centred at the apex of the bowed configuration, which causes the shell to compress inwardly whilst being pushed along the slideway until the shell and slideway tapers are fully engaged, whereupon the tongue snaps outwardly into engagement with a corresponding aperture (not shown) in the slideway.Axial ribs 33 provide reinforcement of thetongue 32 in its condition of engagement with the slideway. Obviously, the parallel-sided shell of Figure 1 could be of similar construction. - An additional advantage of the bowed configuration of the load bearing shell of this invention is that its inherent flexibility permits its insertion into a cast slideway requiring no expensive machining.
- The invention further provides an appreciable saving in weight over conventional bolt-on-bearer plates and, in the case of the nylon shell, a considerable cost saving.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8022932 | 1980-07-14 | ||
GB8022932 | 1980-07-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0044137A1 EP0044137A1 (en) | 1982-01-20 |
EP0044137B1 true EP0044137B1 (en) | 1986-02-12 |
Family
ID=10514738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81302624A Expired EP0044137B1 (en) | 1980-07-14 | 1981-06-12 | Track link for a tracked vehicle |
Country Status (6)
Country | Link |
---|---|
US (1) | US4444441A (en) |
EP (1) | EP0044137B1 (en) |
DE (1) | DE3173761D1 (en) |
GB (1) | GB2081195B (en) |
IL (1) | IL63123A (en) |
IN (1) | IN155939B (en) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5970689A (en) * | 1982-10-14 | 1984-04-21 | Fujisawa Pharmaceut Co Ltd | Method for concentrating aqueous solution of beta-lactam antibiotic substance |
DE3300537A1 (en) * | 1983-01-10 | 1984-07-12 | Hoesch Werke Ag, 4600 Dortmund | TRACK CHAIN FOR ALL-ROUND VEHICLES |
EP0120664B1 (en) * | 1983-03-30 | 1987-05-06 | The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and | Track link adhesion pad assembly |
DE3405699C2 (en) * | 1983-04-22 | 1985-08-01 | Diehl GmbH & Co, 8500 Nürnberg | Device as an assembly aid on caterpillars for tracked vehicles |
US5069510A (en) * | 1985-07-03 | 1991-12-03 | General Dynamics Land Systems, Inc. | Center connector for shoe assemblies of track laying vehicle |
US4700992A (en) * | 1985-07-03 | 1987-10-20 | General Dynamics Land Systems, Inc. | Endless track and components thereof for track laying vehicle |
US4828339A (en) * | 1986-09-30 | 1989-05-09 | Joy Technologies Inc. | Crawler chain |
ES1008467Y (en) * | 1988-03-23 | 1989-11-16 | Zepf Hans-Rudolf | TRACK CHAIN FOR PUBLIC WORKS MACHINERY. |
DE3918500A1 (en) * | 1989-06-07 | 1990-12-13 | Keiper Recaro Gmbh Co | VEHICLE SEAT, PARTICULARLY PASSENGER SEAT |
DE19820175C1 (en) | 1998-04-29 | 1999-12-30 | Diehl Remscheid Gmbh & Co | Track link |
GB2343426B (en) * | 1998-11-05 | 2000-09-20 | William Cook Cast Products Lim | Articulated vehicle track components |
GB2360750B (en) * | 2000-03-31 | 2002-06-12 | William Cook Cast Products Ltd | Articulated vehicle track components and methods and tools for their removal |
AUPS238002A0 (en) * | 2002-05-17 | 2002-06-13 | Mackay Consolidated Industries Pty. Ltd. | Vehicle track chain and link therefor |
US20080018173A1 (en) * | 2006-07-21 | 2008-01-24 | John David Kremer | Rubberized segmented track |
US7673951B2 (en) * | 2008-04-23 | 2010-03-09 | Everpads Co., Ltd. | Track shoe for caterpillar vehicle |
USD709527S1 (en) | 2012-06-29 | 2014-07-22 | Caterpillar Inc. | Undercarriage track idler for mobile earthmoving machine |
USD712935S1 (en) | 2012-06-29 | 2014-09-09 | Caterpillar Inc. | Undercarriage track shoe for mobile earthmoving machine |
USD727974S1 (en) | 2012-06-29 | 2015-04-28 | Caterpillar Inc. | Undercarriage track roller for mobile earthmoving machine |
USD751609S1 (en) | 2012-06-29 | 2016-03-15 | Caterpillar Inc. | Undercarriage track link for mobile earthmoving machine |
USD719588S1 (en) | 2012-06-29 | 2014-12-16 | Caterpillar Inc. | Undercarriage track system for mobile earthmoving machine |
CN203803110U (en) * | 2014-01-21 | 2014-09-03 | 瑞烨世纪(深圳)模型有限公司 | Movable track model with simpleness, glue avoidance and dual-pin structure |
USD769333S1 (en) | 2015-04-01 | 2016-10-18 | Caterpillar Inc. | Track link |
USD767641S1 (en) | 2015-04-01 | 2016-09-27 | Caterpillar Inc. | Track link assembly |
USD775239S1 (en) | 2015-08-13 | 2016-12-27 | Caterpillar Inc. | Rail guide |
USD801395S1 (en) * | 2016-05-16 | 2017-10-31 | Clark Tracks Limited | Haggis link |
USD823349S1 (en) | 2017-05-04 | 2018-07-17 | Caterpillar Inc. | Undercarriage track shoe for mobile earthmoving machine |
DE202019001168U1 (en) | 2019-03-13 | 2020-03-18 | Street-Rubbers GmbH & Co. KG | Chain drive |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3071417A (en) * | 1961-09-18 | 1963-01-01 | Frank A Militana | Tractor shoe with removable traction bars |
US3266853A (en) * | 1963-08-24 | 1966-08-16 | Diehl Fa | Track link units |
FR95351E (en) * | 1963-08-24 | 1970-09-11 | Diehl K G | Vehicle track link. |
DE1605507B1 (en) * | 1963-08-24 | 1971-07-29 | Diehl Kg | Track link for vehicles |
DE2307634C3 (en) * | 1963-08-24 | 1981-12-24 | Diehl GmbH & Co, 8500 Nürnberg | Sliding link for crawler links |
GB1001935A (en) * | 1963-09-14 | 1965-08-18 | Diehl Karl | Improvements relating to track links |
DE7046202U (en) * | 1970-12-15 | 1971-03-25 | Fa Diehl | Track link for vehicles |
GB1405742A (en) * | 1973-02-16 | 1975-09-10 | Diehl | Track link for a tracke vehicle |
US4165906A (en) * | 1978-02-15 | 1979-08-28 | The United States Of America As Represented By The Secretary Of The Army | Track shoe having replaceable pad |
-
1981
- 1981-06-12 DE DE8181302624T patent/DE3173761D1/en not_active Expired
- 1981-06-12 EP EP81302624A patent/EP0044137B1/en not_active Expired
- 1981-06-17 IN IN394/DEL/81A patent/IN155939B/en unknown
- 1981-06-18 IL IL63123A patent/IL63123A/en not_active IP Right Cessation
- 1981-07-10 GB GB8121389A patent/GB2081195B/en not_active Expired
- 1981-07-14 US US06/283,195 patent/US4444441A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US4444441A (en) | 1984-04-24 |
IN155939B (en) | 1985-03-23 |
IL63123A0 (en) | 1981-09-13 |
EP0044137A1 (en) | 1982-01-20 |
GB2081195B (en) | 1984-03-28 |
DE3173761D1 (en) | 1986-03-27 |
GB2081195A (en) | 1982-02-17 |
IL63123A (en) | 1983-11-30 |
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